How can I make my game run at the same speed on any computer?

Description

How can I make my game run at the same speed on any computer?
You need to make sure the game logic gets updated at a regular rate, but skip the screen refresh every now and then if the computer is too slow to keep up. This can be done by installing a timer handler that will increment a global variable at your game logic speed, eg: 
      volatile int speed_counter = 0;



      void increment_speed_counter()
      {
	 speed_counter++;
      }



      END_OF_FUNCTION(increment_speed_counter)



      void play_the_game()
      {
	 LOCK_VARIABLE(speed_counter);
	 LOCK_FUNCTION(increment_speed_counter);



	 install_int_ex(increment_speed_counter, BPS_TO_TIMER(60));



	 while (!game_over) {
	    while (speed_counter > 0) {
	       update_game_logic();
	       speed_counter--;
	    }



	    update_display();
	 }
      }